Drill-press.



0.1. ST. PIERRE.v

DRILL PRESS.

APPLICATION HLED MAR. 19. 19m.

1,293,238. v Patented Feb. 4, 1919;

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o. I. SI. PIERRE.

DRILL PRESS. APPLICATION FILED MAR. I9. I`9IB.

1 ,2.9 3 ,238. Patented Feb. 4, 1919.

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. QCTAVE J. ST. PIERREQO'F'CHAUVIN, ALBERTA, CANADA.

DRILL-PRESS.

Application filed March 19, 1918.

To all whom t may concern:

Be it known that I, OoTAvE J. ST. PIERRE, a subject of the King of Great Britain, residing at Chauvin, in the Province of 'Alberta and Dominion of Canada, have invented new and useful Improvements in Drill-Presses, of which the following is a spe'oiiication. A This invention is an improvement in drill presses and has `for-one of its objects to provide a drill press for garage, household and shop use which is simple and inexpensive in construction and convenient and eiiicient in use, and which is adapted to support a breast drill in such a manner as to permit ready removal of the drill, when desired, so that the be used whenever necessary as a hand drill.

Another object of the invention is to provide a drill press which is of form-a-type construction, that is, composed of parts readily procurable in the open market and which, when assembled, will produce a drill press of novel type and which may be fabricated at a comparatively low cost.

A further Objectis the provision of a construction 0f drill press which admits of the ready, rapid and convenient relative adjustment of the drill and work table, feed of the drill and release of the work.

The inventive idea involved is capable of receiving a variety of mechanical expressions one of which, for the lpurpose of illustrating the invention, is shown in the accompanying drawings, wherein Figure l is a side lelevation of the drill press embodying the present invention.

Fig. 2 is a front elevation thereof.

Figs. 3, 4, 5, 6 and 7 are sections on the lines 3-3, 4`4, 5*5, 6-6 and 7-7, respectively, of Fig. 1.

Fig. 8 is a fragmentary vertical longitudinal section through the lower end of the carrier rod or tube of the press.

he accompanying drawings illustrate what is now believed to be a preferred form of the invention which comprises a standard or base 10 of oblong formation and secured, by suitable fasteners 11, to a wall or other support 12. Fastened at intervals to the standard l0 by means of bolts 13 or the like are the bearings 14, 15, 16 and 17 in which is slidably mounted for vertical movement the carrier rod or tube 18 which'may be a length of ordinary pipe if desired.

Specification of Letters Patent.

. likewise provided with Patented Feb. 4, 1919.

Serial No. 223,354.

Associated with the rod 18 are the upper and lower drill supporting` devices 19 and 20. respectively, each of which consists of a pair of clamping plates 21. The plates of each device are provided at adjacent ends with bearings 22 for partially embracing the rod 18 while the opposite ends ofthe `plates are bearings 23 for recelving the shank 24 of an ordinarybreast drill 25 and the plates of both devices are secured in clamping position by the wing bolts 26 connecting the plates in such manner that the same may be readily and quickly loosened and the devices removed when it is desired to employ the drill 25 in the ordinary manner. By the provision of supporting devices 19 and 20 it will be apparent that the drill 25 will be securely attached to the rod or tube 18 so as to move with the same when it is adjusted vertically in a manner to appear in the course of the description.

It is proposed to yieldably support the rod 18 and consequently the drill 25 in a normally elevated position and, to this end, use is preferably made of an expansible spring 26 coiled about the rod and interposed between the disks or washers 27 and 28 mounted on the rod and respectively in engagement with the lower edges of the bearings 22 of the supporting device 20 and the upper edge of the bearing 15. In this manner the`drill 25 will be maintained above a work table 29 which consists of a web 30 and a sleeve 31, the latter receiving the rod 18 and being disposed between the bearings 15 and 16 whereby movement of the table in a horizontal plane about the rod may be obtained in order to properly position work upon the table before being adjusted for operation thereon by the drill and to remove the work after the operation of the drill has been completed.

After a piece of work has been placed upon the table 29 and the same adjusted properly beneath the drill 25, the latter is lowered into engagement with the work and, for this purpose, a foot operated treadle 32 is preferably employed and has one end bifurcated to form the arms 33 the free inner ends of which are disposed within a recess 34 formed in the front face of the standard thereof and preferably has mounted thereon an auxiliary treadle or pawl 37 inthe form of a bell-crank one arm 38 of which normally extends outwardly over the treadle 32 and is adapted to be depressed against the tension of a leaf spring 39 secured to said treadle 32 and has its free end in engagement with the under surface of the arm 38. The other arm 40 of the treadle or pawl 37 is provided with a toe piece or projection 41 which normally engages one of the teeth 42 of the rack bar 43 secured longitudinally of the lower end of the rod 18 by means of rivets or other fasteners 44 and extending between the parts of the bearing 17. When said projection 41 is so engaged the treadle 32 is supported in a horizontal position, or substantially so, as indicated in Figs. 1 and 2.

ln practice, after the work has been properly positioned on the table 29 and it is desired to lower the drill 25 against the tension of the spring 26, the treadle 32 is depressed by a foot of the operator, or otherwise, and thus cause the pawl 37 to exert a downward pull upon the rod 1S through the medium of the raclr bar 43 and by reason of the attachment of the drill to said rod it will be apparent that the former may be properly adjusted with respect to the work. The rod 18 and drill are returned to normal position by depressing the arm 38 of the pawl 37 to release the projection 41 from engagement with the tooth 42 of the rack bar, whereupon the spring 26 will immediately cause said rod and drill to move upwardly and away from the table 29 and a release of the pressure upon the arm 3S will permit the projection 41 to again engage one of the teeth 42 to support the treadle 32 for the next opera-tion.

Copies of this patent may be obtained for Having thus fully described my invention, I claim Y 1. A drill press comprising a standard, bearings secured thereto, i able vertically in said bearings, drill supporting devices secured to said rod, a work table pivotally mounted upon said rod below said devices and relative to which the same are movable when the rod is adjusted, a spring interposed between said worlr table and one of said devices and normally exerting an upward pressure upon the latter, and means for adjustingV said rod downwardly against the tension of said spring to move a drill carried by said supporting vdevices toward said table, said means including a relatively adjustable element normally engaging said rod and movable out of engagement therewith to permit of a return movement of the rod under the action of said spring.

2.' A drill press comprising a standard, bearings secured thereto, a carrier rod slidable vertically in said bearings, drill supporting devices secured to said rod, a work table pivotally mounted upon said rod below said devices and relative to which the same are movable when the rod is adjusted, a spring interposed between said work table and one of saiddevices and normally exerting an upward pressure upon the latter, a rack bar carried by the lower end of said rod, a foot treadle pivoted to the lower end of said standard, and a spring pressed pawl pivoted to the treadle and normally engaged with said rack bar to adjust the rod downwardly and disengaged therefrom by pressure on the pawl to permit of a return movement of said rod. l

In testimorg whereofl affix my signature.

TAVE J. ST. PIERRE.

five cents each, 'by addressing the Commissioner of Eatents,

Washington, D.' C.

a carrier rod slid- 

